Bucket for turbines.



No. 8631113. .PATENTED AUG. 13, 1907.

G. B. STEVENS. BUCKET FOR TURBINES.

APPLIOATIQN FILED FEB. 14, 1906.

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Wtnesses;

W t/2% George E-StVQFIS, W B w of one of the punchings,

GEORGE E.

s'rnvnus, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY,A CORPORATION OF NEW YORK.

BUCKET :FOR TURBINES.

Specification of Letters Patent.

Patented Aug. 1'3, 1907.

Application filed February 14, 1906. Serial No. 301,027.

To all whom it may concern:

Be it known that I, GEORGE E. STEVENS, a citizen of the United States,residing at Lynn, in the county of Essex and State of Massachusetts,have invented certain new and useful Improvements in Buckets forElastic-Fluid Turbines, of which the following is a speciiication.

The present invention relates to buckets for elasticiluid turbines andhas for its object to provide a form of bucket which is simple inconstruction and cheap to manufacture.

In the accompanying drawings, which illustrate one of the embodimentsofrny invention, Figure l is a partial axial section of a turbine of theCurtis type; Fig. 2 iss partial detailed view showing the bucket-s inplace on the wheel or other support; Fig. 3 a view and Fig. 4 is anenlarged detail view of a slight modification.

1 represents the main shaft oi the turbine and mounted on is the wheel 2having as many peripheral pro- .ions 3 as there are rows of buckets.Between each two projections is a groove or depression in which islocated the bucket securing means. When two or more rows of wheel bucrats are provided, intermediate buckets 4 are provided which are mountedon supports 5, thelatter being carried by the wheel casing 6. Elasticfluid is admitted to the buckets by the nozzle 01' other fluiddischarging device 7. This nozzle may be of the expanding ornon-expanding type, as desired,

and preferably but not necessarily it is of the sectionalizcd type. Theenergy of the motive fluid is trans formed into work in successiveoperations and is finally dis u'ged into the exhaust chamber 8, thelatter being conn ectcd w l the condenser or any suitable exhaust.

in the pi out illustration, three rows of wheel buckets are shown, and'lor that reason my description will be directed chiefly LO the wheelconstruction lu ring that number of rows of buckets, but it is to beunderstood that the number can be increased or decreased, as desired.The buckets 9 are punched out of sheet metal and are Formed integralwith the base 10. In practice the buckets and the base are stamped outof sheet metal in on operation; by a second operation the buckolsarebent at right angles, or substantially right angles, to the. base,- thenext step is to form or shape the portions 1 i that are situated betweenthe projections 3 on the wheel or other support when the parts areassembled. Locatcdin the groove between the projections 3 areretainingdcviccs l2, made in the form of segmental rings and secured tothe wheel by screws 13: The rings are made in segments of suitablelength and the plane of division between the sections or segmen s mayco-incidc with one of the retaining screws 13, as shown in the righthandside of Fig. 2, or the plane of division may be located midway betweensaid screws, as shown in the left-hand side of Fig. 2. i

In order to secure the outer end of the base portions 14 of the buckets,the wheel is dove-tailed, or in other words, each side is provided withan overhanging wall 18 that engages with andretains the beveled end ofthe part 14. Since there is more or less spring to the connectingportion l0and the bases 14, the three buckets can be inserted by simplybendingor buckling the portions 10 and 14, these portions afterwardbeing straightcried out by the locking rings and retaining screws 13. Ifdesired, however, the stock forming the wheel can be rolled or forcedover the bases 14, as In other words the edge portion of the wheel orsupport is deformed at 18 and is afterwards cured of its deformity byforcing the part 18 over the base 14 to secure the buckets. I may,however, use the locking rings with a different form of base securingmoans.

Each row of buckets is provided with a cover ll made of sheet metal andprovided with. a series of openings rranged in a row to receive thetenons 1? formed on the ends of the buckets. The cover is secured inplace by riveting over the tenons on the buckets. The plane or" divisionbetween the segments may be located midway between the segments, asshown in the left-hand side or Fig. 2, or it may coincide with thetenon, as shown in the righthand side of Fig. 2.

I have shown the invention in connection with the Wheel buckets only,since they are much more numerous than the intermediate buckets and theexpense oi making them is, therefore, considerably greater. It is to beunderstood, however, that the invention is also applicable to theintermediate buckets.

The invention is shown in connection with a machine of the impulse type,but it is to be understood that it can be used with a reaction or othertype of r h' It is evident from 1118 foregoing that as man on sets maybe stamped in one operation as are desi ed, with suitable connectingportions 10. The invention is particularly appliable to small sizemachines where economy in construction is of very great importance, butit is also applicable to machines of larger size.

In accordance with the provisions of the patent statutes, I havedescribed the principle oi operation of myinvcntion, together with theapparatus which I no w consider to represent the best embodimentthereof; but I desire to have it uhdorstood that the apparatus shown ismerely illustrative, and that the invention can in: carried out bybthermeans.

What I claim as'new and desire to secure by Letters Patent oi the UnitedStates, is,

1. In an elustiefiuid turbine, the combination of a supshown in Fig. 4.

port, a sheet metal bucket having a base formed integral therewith, anda device which extends across the base for securing the bucket to thesupport.

2. in an elastic-fluid turbine, the combination of a support, sheetmetal buckets having a base that is common to and integral therewith,and a device which extends across the base and acts as a means commonto.the buckets for securing them to the'support.

3. in an elastic-fluid turbine, the combination of asupport, sheet metalbuckets arranged thereon in separate rows, a base piece which is commonto and integral with the buckets, and a retainer which crosses the basepiece for securing the buckets and is located between the rows.

4. in an elastic-fluid turbine, the combination of a support, a sheetmetal bucket having an integral base piece projecting each side thereof,and retainers which overlie the base piece and secure the bucket tot hesupport.

3. in an elastie-iiuid turbine, the combination of a support havingprojections thereon, sheet metal buckets which are supported by theprojections, 51 base piece formed in te 'ral with two or more bucketswhich is located in the groove between the projections, and retainersthat occupy the 'roores and hold the buckets in place.

6. in an elastieiluid turbine, the combination of a support, sheet metalbuckets arranged in rows thereon, a base piece formed integral with andconnecting buckets of ditlercnt rows, and retainers which secure thebuckets at a point between the rows.

T. in an elastic-fluid turbine, the combination or a support. sheetmetal buckets arranged in rows thereon, a base piccc formed integralwith and connecting buckets of different rows. retainers which securethe buckets at a point between the rows, and means for securing thebase-piece at the ends.

H. in an elastic-fluid turbine, the combination of a stipport, bucketscarried thereby and arranged'in rows, a base common to and integral withthe buckets in different rows, retainers for the buckets which extendacross the base and are common to adjacent rows.

\th in an elastic-fluid turbine, the combination of a support, aplurality of buckets carried thereby and arranged in rows, the saidbuckets being formed of sheet metal and each provided with an integraltenon, abase piece common to and connecting buckets of difiterent rows,and a. cover 7 that issecured to the ends of the buckets by the tenonsthereon.

10. In an elastic-fluid turbine, the combination of a support having adeformed edge portion, with buckets having bases with outwardlyprojecting edges mounted on the support which are secured in place bycuring the support ,of its deformity by forcing the metal of which it iscom posed'over one of the edges of the bucket bases to secure thebhckets against movement in the-plane of the support 11. In anelastic-fluid turbine, the combination of a support having parallelprojections thereon, with grooves between, buekets mounted on theprojections having bases which extend across the grooves, and segmentallocking pieces located in the grooves which extend across the bases.

13. As an article of manufacture, a bucket element which is punched outof sheet metal and has a base piece common to two or more buckets, thesaid buckets being arranged to form an angle with the base-piece.

In witi ess whereof, I have hereunto set my 'hand this tenth da ofFebruary, 1906.

' Gnonon STEVENS.

Witnesses Jenn A. MeMANUs, Jr., Hnnnr 0. WESTENDARP.

